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  • Azithromycin no better...

Azithromycin no better than placebo among patients of LRTI with low procalcitonin levels: Lancet

Dr.Niharika Harsha BWritten by Dr.Niharika Harsha B Published On 2022-12-19T20:00:24+05:30  |  Updated On 20 Dec 2022 7:32 AM GMT
Azithromycin no better than   placebo among patients of LRTI  with low procalcitonin levels: Lancet
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A recent trial found that in adults with lower respiratory tract infections and lower procalcitonin concentration, the placebo was not non-inferior to Azithromycin for clinical improvement at day 5. This questions the necessity of antibiotics for clinical improvement and solicited adverse events for patients with lower respiratory tract infection and a low procalcitonin concentration. The...

A recent trial found that in adults with lower respiratory tract infections and lower procalcitonin concentration, the placebo was not non-inferior to Azithromycin for clinical improvement at day 5. This questions the necessity of antibiotics for clinical improvement and solicited adverse events for patients with lower respiratory tract infection and a low procalcitonin concentration. The trial results were published in the journal The Lancet Infectious Diseases.  

Antibiotics are the frequently prescribed medications for Lower respiratory tract infections, despite a viral etiology in many of them. As there is uncertainty on the fact that antibiotics do not benefit patients with low procalcitonin concentrations with lower respiratory tract infection researchers compared the efficacy and safety of azithromycin versus placebo to treat lower respiratory tract infections in patients with low procalcitonin. 

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A randomized, placebo-controlled, double-blind, non-inferiority trial was conducted at five health centers in the USA between Dec 8, 2017, and March 9, 2020. Eligibility for inclusion into the trial included adults aged 18 years or older with clinically suspected non-pneumonia lower respiratory tract infection and symptom duration from 24 h to 28 days. Randomization of the participants with a procalcitonin concentration of 0·25 ng/mL or less was done (1:1), in blocks of four with stratification by site, to receive over-encapsulated oral azithromycin 250 mg or matching placebo (two capsules on day 1 followed by one capsule daily for 4 days). Masking of the participants, non-study clinical providers, investigators, and study coordinators were done for treatment allocation. The primary outcome was the efficacy of azithromycin versus placebo in terms of clinical improvement at day 5 in the intention-to-treat population. The non-inferiority margin was –12·5%. Solicited adverse events like abdominal pain, vomiting, diarrhea, allergic reaction, or yeast infections were recorded as secondary outcomes. 

Findings of the trial: 

  • Of the 691 patients assessed for eligibility, 499 were enrolled and randomly assigned to receive azithromycin (n=249) or a placebo (n=250).
  • In the intention-o-treat analysis, clinical improvement at day 5 was observed in 148 (63%, 95% CI 54 to 71) of 238 participants with full data in the placebo group. 
  • Clinical improvement at day 5 was seen in 155 (69%, 61 to 77) of 227 participants with full data in the azithromycin group in the intention-to-treat analysis (between-group difference –6%, 95% CI –15 to 2).
  • The 95% CI for the difference did not meet the non-inferiority margin.
  • Except for increased abdominal pain associated with azithromycin, solicited adverse events and their severity was not significantly different between groups at day 5 in the Azithromycin group (47 [23%, 95% CI 18 to 29] of 204 participants) compared with placebo (35 [16%, 12 to 21] of 221; between-group difference –7% [95% CI –15 to 0]; p=0·066).  
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Thus, the placebo was not non-inferior to azithromycin in terms of clinical improvement at day 5 in adults with lower respiratory tract infection and a low procalcitonin concentration. 

Further reading: Tsalik EL, Rouphael NG, Sadikot RT, et al. Efficacy and safety of azithromycin versus placebo to treat lower respiratory tract infections associated with low procalcitonin: a randomized, placebo-controlled, double-blind, non-inferiority trial [published online ahead of print, 2022 Dec 13]. Lancet Infect Dis. 2022; S1473-3099(22)00735-6. doi: 10.1016/S1473-3099(22)00735-6

Lower respiratory tract infectionsantibioticslow procalcitonin concentrationsazithromycinplacebonon-inferiority trialstratificationclinical improvementadverse events
Source : The Lancet Infectious Diseases
Dr.Niharika Harsha B
Dr.Niharika Harsha B

    BDS, MDS

    Dr.Niharika Harsha B (BDS,MDS) completed her BDS from Govt Dental College, Hyderabad and MDS from Dr.NTR University of health sciences(Now Kaloji Rao University). She has 4 years of private dental practice and worked for 2 years as Consultant Oral Radiologist at a Dental Imaging Centre in Hyderabad. She worked as Research Assistant and scientific writer in the development of Oral Anti cancer screening device with her seniors. She has a deep intriguing wish in writing highly engaging, captivating and informative medical content for a wider audience. She can be contacted at editorial@medicaldialogues.in.

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